"strict" is a relative term. There are "pirate" stations in certain areas of the country that have been operating but use various loopholes in non-fcc related laws that contradict the fcc regulations. The pirate stations openly sell advertising or hourly sponsorships to local businesses and even politicians seeking re-election. Boston, Patterson NJ are two stations I am familiar with. So, the FCC would like to be strict but some smart lawyers know other laws that essentially allow broadcasts. The $10,000 fines are single fines, not per day or per hour of broadcast and only one $10k fine can be before the courts at a time so pleading not guilty, postponing hearing dates, appealing the fine and ultimately paying a fine has been part of the business model of some of these "pirate" stations for years.
In the last year or so, a new law was passed to make FCC enforcement easier and these stations were shuttered... for a few weeks. Shortly after Trump signed the law, he signed an executive order that removed certain regulatory burdens on small businesses. So... stations claiming the right reasons for avoiding regulatory burdens essentially get consent degrees from the FCC.
The big problem the FCC has is they claim "pirate" stations interfere with other licensed broadcasters but they are never able to prove that wild claim at the trial.
Also, strict, means someone filed an online complaint of interference with their tv signal and the FCC investigates and finds some guy with a soldering iron attempting to build something that causes interference. The FCC says, hey, stop doing that. They may take it away if it was designed to broadcast - but I have not heard of anyone EVER paying a fine for stupid, unintended interference.